Printing press brake



Dec. 12, 1950 R. E. SLEIGHT 2,534,075

PRINTING PRESS BRAKE Filed Sept. 29, 1949 /4 52 LCL g //1 L 45 I U Z; Z 20 t1;

Pai /70 z: jZ r fitter-ray Patented Dec. 12, 1950 UNITED STATES PATENT OFFICE PRINTING PRESS BRAKE Roland E. Sleight, Philadelphia, Pa.

Application September 29, 1949, Serial No. 118,549

1 Claim. 1

In printing presses of the type which employ a reciprocating fiat bed and a freely rotatable ductor roll for transferring ink from the fountain roll to the bed, it is customary to use a brake for preventing, or for regulating, the rotary movement imparted to the freely rotatable ductor roll as a result of its contact with the reciprocating fiat bed. The reasons for using such brake are now too well known in the art to require detailed exposition in the present application. See, for example, such patents as Miehle No. 650,853 of June 5, 1900, Dennis No. 2,178,740 of Nov. '7, 1939, and. Dudley No. 2,239,168 of April 22, 1941.

The object of the invention is to produce an improved ductor roll brake of the type referred to.

The structure and advantages of the invention will be understood from the following specification and the accompanying drawings in which:

Fig. 1 is a side elevational view of a brake embodying the invention, the same being shown in its non-engaging position, certain parts being omitted.

Fig. 2 is a vertical sectional view of Fig. 1 with the brake shown in engaging position.

Fig. 3 is a section on line 33 on Fig. 1.

A brake embodying the invention includes a pedestal I adapted to be mounted adjacent one end of a ductor roll, generally referred to by the numeral 12, and a movable member [4 which is hinged to the body member at l6 and which 1 carries means for applying pressure to the duotor roll in a manner hereinafter more fully described.

The doctor roll 12 includes a relatively soft outer padding [8 (for transferring ink from the ink roll not shown, to the reciprocating fiat bed of a printing press, also not shown) and a supporting shaft 28 having a reduced end portion 22. The reduced end portion 22 of the ductor roll shaft is journalled in a support, not shown, and means, also, not shown, is provided for reciprocating the doctor roll between the ink, or fountain roll and the reciprocating fiat bed of the printing press. For specific examples of the manner in which the ductor roll may be reciprocated reference may be had to the patents above mentioned.

The lower end of the body member ll] of the brake is concaved as at 25, to engage the reduced end 22 of the ductor roll shaft. The body I0 is also provided with lateral flanges 28 which are adapted to engage seats in a support, not shown.

The pressure applying mechanism includes a stem 36 which passes through a guide aperture in the hinged member 14 and which is tensioned. downwardly by a spring 38 confined between the head l4 and a loose washer All carried by the lower end of the stem. The Stem 36 is provided with an enlarged head, or nut, 42, which is too large to pass through the guide opening in the member 14, and thus limits the movement of the stem, downwardly, as viewed in the drawings, relative to the hinged member 14.

The pressure applying mechanism further includes a curved shoe M which is provided, on its underside, with a friction member 48 for engaging the shaft 20 as shown in Fig. 2. The shoe 44 is connected to the lower end of the stem 36 by means of a universal ball and socket joint 50, so as to be movable in all directions.

The brake illustrated also includes means for looking it in the effective position of Fig. 2, and for permitting its movement to the idle position of Fig. 1. This means includes a latch member 52 which is pivoted to the body H] as at 56 and which is normally biased in counter-clockwise direction in Fig. 1 by means of a coil spring 56. The inner end of the latch member 54 is provided with a seat 56 adapted tobe engaged by a shoulder 58 formed on adjacent edge of the pivoted member M. The outer end of the latch member 52 is provided with a handle 60.

To mount the brake on the end of a ductor shaft, the brake in the position of Fig. 1, is presented to the right hand end of the shaft, the flanges 23 are inserted into seats so and the brake is moved to the left in Figs. 1 and 2 until the shoe d4 registers with the desired portion of shaft 20. The movable body M is then rotated in counter-clockwise direction so as to bring the parts to the position of Fig. 2 in which the shoe 48 engages the shaft 26 with a pressure determined by the spring 38. Because the shoulder 58 of the body [4 rests on seat 55 in latch member 50 and because the portion of the latch member to the left of pivot 54 in Fig. 2 rests on or is very close to the pedestal IE], the movable body I l cannot be moved in clockwise direction as long as the parts are in the position of Fig. 2. This provides a positive lock and insures against the brake moving to the position of Fig. 1 in response to vibrations and impacts which are incidental to the operation of the press.

In order to move the stem 38 and shoe id to the position of Fig. 1, the handle is depressed against the action of spring 56. This results in clockwise rotation of the latch member 52 and in counter-clockwise rotation of movable member M until the inner edge of seat 55 clears the underside of the adjacent edge of the shoulder 58, as shown in broken lines in Fig. 2. The body 3 I 4 can now be rotated, in clockwise direction, from the position of Fig. 1 to that of Fig. 2. It will be understood that, when the brake is in the position of Fig. 2, the spring 38 is not wholly compressed so that it can yield enough to permit the counter-clockwise rotation of the body M which is required to permit disengagement of shoulder 58 from seat 56. To bring the parts back to the positionof Fig. 1, the latch member 52 is rotated simultaneously with the rotation of the body member M in clockwise direction until the shoulder 58 again engages the seat 56.

What I claim is:

A brake for a printing press of the type which,

includes a shaft, and a ductor r011 carried by said shaft, said brake including appedestal ,detaohs ably journalled on said shaft in proximity to said ductor roll, a first body member pivoted to-- the inner portion of said pedestal and having a guide opening in theinner portion thereof, astem having a limited slidingmovement insaid ductor roll, aspring carried by said stem and in' counter-clockwise direction confined between said first body member and said shoe for biasing said shoe against said shaft when said first body member is in said first position, a shoulder formed on the outer edge of said first body member, a second body member pivoted to the outer portion of said pedestal adjacent said first body member, there being a seat formed in the inner edge of said second body member adaptedto be engaged by said shoulder, said second "body member. being movable to a first position in which said shoulder engages said seat and said first body member is locked in its first position, and to a second position in which said'jshoulder is disengaged from said seat and said first, body member can be moved to its second' position, and a spring between the outer portion of-saidqsecondbody member and said pedestal for biasing said second member to its first position.

ROLAND E. SLEIGHT.

REFERENCES CITED The following references are of record: in the file-of this patent:

UNITED STATES PATENTS 

